Ink for golf ball, transfer printing film for golf ball and marked golf ball

Abstract

Provided as ink for a golf ball for use in marking a golf ball is ink for a golf ball including an ink resin having a predetermined hydroxyl value and block isocyanate. When marking a golf ball by using the ink of the present invention, a hydroxyl group in the ink resin in an ink layer and an isocyanate group derived from the block isocyanate react with each other to increase hardness of the ink layer, thereby improving abrasion resistance of the marking. In addition, the isocyanate group derived from the block isocyanate and a functional group of an ionomer resin on the ball surface react with each other to improve adhesiveness of marking to the ball surface. Furthermore, the hydroxyl group of the ink resin and an isocyanate group in a urethane top coat layer react with each other to increase strength of the ink layer, thereby improving hitting resistance of the marking. Then, nitrogen in urethane bonding generated by the reaction between the hydroxyl group in the ink layer and the isocyanate group and the isocyanate group in the urethane top coat layer react with each other to further improve abrasion resistance of the marking.

1. Ink for a golf ball for use in marking a golf ball, including an ink resin having a predetermined hydroxyl value and a block isocyanate, wherein the ink resin includes a urethane resin, and a polyester resin and/or an epoxy resin, and a dissociation temperature of the block isocyanate ranges from 90 to 120° C. 
     
     
       2. The ink for a golf ball according to  claim 1 , wherein a hydroxyl value of the urethane resin is less than 0.2 or zero and a hydroxyl value of the polyester resin or the epoxy resin is not less than 60 and not more than 250. 
     
     
       3. The ink for a golf ball according to  claim 1 , including a dissociation catalyst of the block isocyanate. 
     
     
       4. The ink for a golf ball for use in marking a golf ball according to  claim 3 , including with respect to 100 parts by weight of the urethane resin, 5 to 10 parts by weight of at least either one of the polyester resin and the epoxy resin, 1 to 15 parts by weight of the block isocyanate and 0.1 to 3 parts by weight of the dissociation catalyst. 
     
     
       5. A transfer printing film for a golf ball for use in marking a golf ball, wherein a predetermined pattern to be transferred onto a golf ball is formed on a base film by the ink for a golf ball according to  claim 1 . 
     
     
       6. A marked golf ball having a predetermined pattern marked by the ink for a golf ball according to  claim 1 . 
     
     
       7. Ink for a golf ball for use in marking a golf ball, including an ink resin having a predetermined hydroxyl value and a block isocyanate, wherein a dissociation temperature of the block isocyanate ranges from 90 to 120° C. and isocyanate groups freed from the block isocyanate bond not only with hydroxyl groups of the ink resin but also with functional groups existing on the ball surface. 
     
     
       8. The ink for a golf ball according to  claim 7 , wherein the ink resin includes a urethane resin, and a polyester resin and/or an epoxy resin. 
     
     
       9. The ink for a golf ball according to  claim 8 , wherein a hydroxyl value of the urethane resin is less than 0.2 or zero and a hydroxyl value of the polyester resin or the epoxy resin is not less than 60 and not more than 250. 
     
     
       10. The ink for a golf ball according to  claim 8 , including a dissociation catalyst of the block isocyanate. 
     
     
       11. The ink for a golf ball for use in marking a golf ball according to  claim 10 , including with respect to 100 parts by weight of the urethane resin, 5 to 10 parts by weight of at least either one of the polyester resin and the epoxy resin, 1 to 15 parts by weight of the block isocyanate and 0.1 to 3 parts by weight of the dissociation catalyst.